/Engine/Plugins/Runtime/ZoneGraph/Source/ZoneGraph/Public/ZoneGraphTypes.h
Describes how the linked lane relates to the lane spatially. Each type is a bitmask, so that some APIs can filter based on link types.
enum EZoneLaneLinkType { None = 0, All = ((uint8) 0xff), Outgoing = 1 << 0, Incoming = 1 << 1, Adjacent = 1 << 2, }